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The production of cellulose diacetate (CDA) faces an ongoing challenge with the formation of insoluble colloidal materials, referred to as insoluble gel particles (IGP). CDA is typically dissolved in solvents like acetone for processing into commercial products. However, IGP presents challenges in the production of commercial CDA-based products, potentially impacting both intermediate processing and quality of the final products. IGP formation is connected to factors such as incomplete acetylation and the presence of hemicellulose acetates, but its root cause is still debated. This study primarily investigates the impact of hemicelluloses on IGP formation during CDA production. To study IGP formation, we proposed scenarios using xylan acetate (XA) as a model impurity. The results show that the precipitation process employed for CDA recovery plays a crucial role in IGP formation, with acetone-soluble CDA also contributing to IGP formation during precipitation. Additionally, the persistence of IGP is influenced by the behavior of XA in redissolution solvents. [ABSTRACT FROM AUTHOR]